Accessing a variable that is out of scope Swift

Question

I know the is elementary stuff but I can't seem to get this. I have a function that takes the date pickers value, converts it to a string, assigns it to a variable, and them updates a labels text.

I want to be able to access that variable outside of the function so I can use it in prepareForSegue. So far I have tried making a global variable and updating it when the function is called but that didn't seem to work, and I have tried returning the value in the function but I must have done that wrong because it didn't work either.

The Function:

func datePickerChanged(datePicker:UIDatePicker) { var dateFormatter = NSDateFormatter() dateFormatter.dateStyle = NSDateFormatterStyle.FullStyle dateFormatter.timeStyle = NSDateFormatterStyle.ShortStyle var strDate = dateFormatter.stringFromDate(datePicker.date) dateTimeLabel.text = strDate }

I want to get strDate out of the function. Any help is much appreciated!

Fred Faust · Accepted Answer · 2016-04-29 01:37:59Z

You can do this in different ways.. You can use an inout parameter on a method to allow the method to update the parameter, like this:

var aString = "" func doStuffWithA(inout theString: String) { theString = "Groovy" } doStuffWithA(&aString) // changes aString to "Groovy"

Or you can declare the property outside of the method:

class SomeClass { var someString: String = "" func doStuff() { self.someString = "Groovy" } }

If you want this just for a segue, you can pass the object on performSegueWithIdentifier, like this:

func doStuff() { var aString = "Groovy" performSegueWithIdentifier("someSegue", sender: aString) } // Then here you can use it and assign it as a property on the next view controller override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) { if segue.identifier == "someSegue" { guard let aString = sender as? String else { return } let nextVC = segue.destinationViewController as! SomeVC nextVC.someProperty = aString } }

Thanks so much! I was trying to use option 2 myself but must have been missing something. Your version works.

SunilG · Accepted Answer · 2016-04-29 01:52:09Z

If you want it to be accessible through out the class an out of function this is how you can do

class xyz { var startDate:String? func datePickerChanged(datePicker:UIDatePicker) { var dateFormatter = NSDateFormatter() dateFormatter.dateStyle = NSDateFormatterStyle.FullStyle dateFormatter.timeStyle = NSDateFormatterStyle.ShortStyle self.startDate = dateFormatter.stringFromDate(datePicker.date) dateTimeLabel.text = self.startDate } }

Collectives™ on Stack Overflow

Accessing a variable that is out of scope Swift

2 Answers 2

1 Comment

Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Linked

Related